Cryptosporidiosis is a diarrheal disease caused by the Cryptosporidium parasite. It primarily affects the intestines of humans and various animals. It is a common cause of recreational water illness worldwide, particularly problematic for individuals with weakened immune systems.
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The *Cryptosporidium* parasite was first identified in mice in 1907, but it wasn't recognized as a human pathogen until the 1970s. It gained significant attention with the 1993 Milwaukee outbreak, the largest waterborne disease outbreak in US history. Its importance grew further as a common opportunistic infection in individuals with HIV/AIDS.
Cryptosporidiosis spreads through the fecal-oral route by ingesting oocysts, the infective form of the parasite. This commonly occurs through contaminated drinking or recreational water, as oocysts are highly resistant to chlorine. It can also spread through contaminated food or direct contact with infected people or animals.
Contagious Period: Varies by disease
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This event envelope contains reports on cryptosporidiosis in Canada.
Source: BEACON - View Full Report
This event folder catalogues outbreaks of Cryptosporidiosis in USA.
Source: BEACON - View Full Report
Cryptosporidiosis is an important cause of gastroenteritis in Australia, typically spread through contaminated water, food, and contact with infected people or animals. It has historically shown a seasonal pattern, with peaks in summer and, in some livestock-dense states, spring. Multiple pool‑associated clusters have been reported in recent years, prompting public health alerts and swimming pool closures.
Source: BEACON - View Full Report
This event envelope contains reports on cryptosporidiosis in Scotland.
Source: BEACON - View Full Report
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Official guidance from the U.S. Centers for Disease Control and Prevention
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View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-06-19
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